I need to responde to this question as to why modeling is important and why ERD is a good diagram program and I'm not sure how to respond to the ERD

I need to responde to this question as to why modeling is important and why ERD is a good diagram program and I'm not sure how to respond to the ERD part

Modeling is a pretty important part of the design process. Modeling allows you to clarify what the system does, while modeling you are able to spot errors and view interactions between other systems. Modeling helps to remember details about the program and help the team work together to meet one goal. Finally, by modeling you are pretty much documenting the program for future references.

I would probably use an ERD (Entity relationship diagram) an ERD seems like a easy to understand diagram with well-organized documentation.